A description of the paths to be followed by the spacecraft of the future is presented. Some basic information in astronomy is first given, mainly with regard to the Earth, the Moon, and other planets of the solar system. Special charts of the apparent trajectories of the planets and of their orbit in orthogonal projection are shown. These charts clearly demonstrate the intricacies and complexities of navigation of spacecraft in outer space among the complex paths of planets and planetoids. Some calculations relating to spacecraft navigation and velocities are given. A general supplement to the entire series includes an annals and a bibliography of interplanetary travel and a name and subject index.

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